How can I select human miRNA from affy chip while analyzing data using R?

I'm not entirely sure what your data frame looks like, given that I haven't worked with Affy chips before. Let me try to summarize what I think you have told us. You have a data frame with a list of all of the microRNAs on the Affy chip, along with their expression data.

You want to select a subset of these microRNAs that are unique to humans.

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